For Isntree, the price on this is quite high, it's far from a cheap ampoule. But with that said, I think it's still really good value, with an endless list of effective and calming ingredients. I really think this is a solid choice for a calming serum/ampoule. Isntree makes some really top notch products with beautiful and amazing ingredients and this is another example of that. Me personally, I didn't see much happening to my skin from using it for a week, but I've seen some amazing results from other people, redness and acne calmed and faded away. I'm using different products at the moment but I will try it again when I finish my other serums and I'm eager to see good results when I fully commit to this.